I am using a XBee to receive data from an arduino network. But they have AP=2 which means escaped characters are used when a 11 or 13 appears (and some more...)
When this occurs, XBee sends 7D and inmediatly XOR operation with char and 0x20. I am trying to recover the original character in python but I don't know ho to do it. I tried something like this: read = ser.read(4) #Read 4 chars from serial port for x in range (0,4): if(toHex(read[x]) != '7d'): #toHex converts it to hexadecimal just for checking purposes if(x < 3): read[x] = logical_xor(read[x+1], 20) #XOR for y in range (x+1,3): read[y] = read[y+1] read[3] = ser.read() else: read[x] = logical_xor(ser.read(), 20) #XOR data = struct.unpack('<f', read)[0] logical_xor is: def logical_xor(str1, str2): return bool(str1) ^ bool(str2) I check if 7D character is in the first 3 chars read, I use the next char to convert it, if it is the 4th, I read another one. But I read in python strings are inmutables and I can't change their value once they have one. What would you do in this case? I started some days ago with python and I don't know how to solve this kind of things... -- http://mail.python.org/mailman/listinfo/python-list